The heart is a hollow muscular organ that contracts approx. 100,000 times a day and pumps approx. five liters of blood into the circulation every minute. It is not only characterized by the unique features of muscle tissue specialized to meet the constant physical demands of pumping blood, but also by muscle cells that send spontaneous rhythmic electrical impulses to stimulate contraction. This article gives an overview of the structure of the heart wall and of cardiac muscle tissue.

00:00
Now the valves of the heart the cardiac valves.
We have valves that are located between theatria and the ventricles. We'll also have
valves, as we'll see in the next slide,between the ventricles and the great arteries
that issue from the ventricles.
00:20
But I'll stop here. Our focus here is on
the two valves between the atria and the ventricles.
00:28
This is the right atrioventricular valve here.
It has three cusps: one, two, three. Henceanother name for this valve is the tricuspid
valve. And we can name these cusps. And whenwe name them, we'll have an anterior cusp,
a posterior cusp and then a septal cusp asit lies towards the interventricular septum separatingthe right ventricle from the left ventricle.
01:02
Over here, we have the left atrioventricular
valve between the left atrium and the leftventricle. It has two additional names. One
of those is bicuspid ' because we have twocusps: an anterior cusp and a posterior cusp.
And a third name that's attached to thisparticular valve is mitral. And the medical
lexicon tends to use mitral more commonly.
01:36
Now let's take a look at the valves that
are between the ventricles and the great arteriesthat issue from them.
01:44
Here we can see the two valves at this level
and this level. If we start here with thevalve set that's most anterior, here we're
looking at the valve located between the rightventricle and the pulmonary trunk leaving
the right ventricle. So this is receivingblood that will be delivered to the lungs.
02:10
The pulmonic valve or semilunar valve has
three cusps and they're named: this is theanterior one, here's the right one and here's
the left one. So the right and left lie moreposterior than the anterior. And then if we
look here, this profile is demonstrating thevalve that exist between the left ventricle
and the aorta. This is the aortic semilunarvalve. And it has three cusps which can be
named: this is the right one, this is theleft one and this one is the posterior one.
02:56
What we cannot appreciate in this view is
that the right and left cusps right abovethem, there will be orifices or ostia that
will lead to the coronary arteries. So theright coronary artery would issue right above
this planar section, the left right abovethis planar section. So these are coronary
cusps. And the one behind here or posteriordoes not issue a coronary artery. So it's
a non-coronary-related cusp. So that leads

About the Lecture

The lecture Valves – Heart (Cor) by Craig Canby, PhD is from the course Thoracic Viscera.

Included Quiz Questions

How many cusps does the semilunar valve have?

3

1

2

4

5

The aortic semilunar valves have 3 cusps. Which of the following are their correct anatomical names?

Right, left, and posterior

Anterior, posterior, and dorsal

Right, left, and anterior

Lateral, medial, and posterior

Anterior, posterior, and septal

What cardiac valve is composed of right, left, and posterior cusps?

Aortic valve

Pulmonic valve

Right tricuspid valve

Left bicuspid valve

Mitral valve

Author of lecture Valves – Heart (Cor)

Craig Canby, PhD

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